Honda CRX silhouetteCRX

Emission Control System — Tailpipe Emission / Positive Crankcase Ventilation System

6-90prose procedure

CO spec and adjustment differ for With CATA (0.1% max, ECU troubleshooting) vs Without CATA (1.0 ± 1.0%, adjust IMA sensor screw).

Tailpipe Emission

Inspection

  1. 1
    Start the engine and warm up to normal operating temperature (cooling fan comes on).
  2. 2
    Connect tachometer.
  3. 3
    Check idle speed and adjust the idle speed, if necessary (page 6-69).
  4. 4
    Warm up and calibrate the CO meter according to the meter manufacturer's instructions.
  5. 5
    Check idle CO with the headlights, heater blower, rear window defogger, cooling fan, and air conditioner off.
    Idle mixture adjuster (IMA) sensor with a magnified inset showing the adjusting screw used to adjust CO on models without CATA.
Specified CO% — With CATA
0.1% maximum
Specified CO% — Without CATA
1.0 ± 1.0%

Positive Crankcase Ventilation System

Inspection

  1. 1
    Check the crankcase ventilation hoses and connections for leaks and clogging.
    Engine compartment view of the crankcase ventilation system identifying the PCV hose, breather hose and PCV valve.
  2. 2
    At idling, make sure there is a clicking sound from the PCV valve when the hose between PCV valve and intake manifold in lightly pinched with your fingers or pliers.
    Detail of the hose between the PCV valve and intake manifold, showing where to gently pinch it to check for a clicking sound.
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